Pencil attachment



May 16, 1939.

3024MB l2 e 54 4e 42 36 015:0 5 45 4o 35 3025 l2 8 4 363228 24 2016 6 3 7242/ 181512 s 42 3528 ZI I4 '7 63 56 48 E. SANDERS `PENCIL ATTACHMENT Filred Oct. 18, 1957 INVENTOR ATTO R N EYS Patented May 16, 1939 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a calculator and has for the primary object the provision of a device of this character which may form a permanent part of another device such as a pen, pencil or some other instrument or may be made in the form of an attachment which may be readily adapted to a pen or pencil as a cap to act as a protector and as an eraser carrier.

Another object of the invention is the provision of an efiicient and inexpensive device whereby a person may, through a simple manipulation of said device, obtain answers or the result in the multiplication of selected numbers.

With these and other objects in View, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a side elevation illustrating my invention as a part of a pencil.

Figure 2 is a side elevation, partly in section, illustrating inner and outer sleeves mounted for relative rotation with respect to each other.

Figure 3 is a side elevation illustrating the outer sleeve acting as a carrier for an eraser.

Figure 4 is a side elevation illustrating the inner sleeve.

Figure 5 is a fragmentary side elevation illustrating a result or answer table and of cylindrical shape also including a column of numbers known as the multiplicands.

Figure 6 is a plan view of the table prior to being made into cylindrical shape.

Figure 7 is a plan view showing the blank from which the inner sleeve is made.

Referring in detail to the drawing, the numerals I and 2 indicate inner and outer sleeves rotatably connected and 'held against endwise movement relative to each other. An annular rib 3 is formed on the inner sleeve and is received by an annular groove formed in the outer sleeve 2 for rotatably n connecting said sleeves and preventing endwise movement of said sleeves relative to one another. The outer sleeve 2 extends beyond one end of the inner sleeve I to provide a carrier for an eraser 5 while the opposite end thereof terminates short of the other end of the inner sleeve to expose a portion of said inner sleeve. Said exposed end of the inner sleeve I is provided with a pointer I in the form of a notch and also has formed therein spaced openings 8, nine in number and arranged spirally from one end of said inner sleeve to the opposite end. The outer sleeve 2 is provided with a slot 9 extending substantially the full length thereof and opening outwardly through one end to provide a pointer I0 and to act as a Window through which the openings 8 one at a time may be exposed.

A core II of cylindrical shape fits in the inner sleeve and bears a table setting forth the answers cr results and are indicated by the character B and also have a column of figures reading from one to nine and are indicated by the character C. The numbers B of the table are arranged in rows extending diagonally of the core while the numbers C extend in column formation or annularly of the core.

In operation, a person employing this device to work the multiplication table of one to nine, after selecting the desired multiplier moves the pointer I0 opposite thereto and moves the pointer l opposite the selected multiplicand which brings about relative rotation of the inner and outer sleeves. One of the openings B of the inner sleeve moves over the proper answer on the table and the slot moves over the respective opening thereby exposing to View the answer. Thus it will be seen that a simple, durable and inexpensive device can be provided to permit a person to quickly and accurately obtain answers in multiplication of selected multipliers and multiplicands.

The core H as heretofore described may be a pen or pencil having the table B and numbers C thereon so that the sleeves I and 2 may be adapted over the table or if desired, the core may be in the form of a sleeve to fit in the sleeve I and receive therein a pen or pencil.

What is claimed is:

i peneil attachment comprising inner and outer sleeves, an annular rib formed on the inner sleeve received in an annular groove formed on the outer sleeve for rotatably connecting said sleeves and preventing relative endwise movement thereof7 the outer sleeve extending beyond one end the inner sleeve, the opposite end of the outer sleeve terminating short of the end of the inner sleeve to expose an end portion oi said inner sleeve, said exposed end portion being provided with a pointer in the form of a notch, one of said sleeves being provided with a spiral row of spaced openings extending from one end to the opposite end of the sleeve, the other sleeve being provided with a slot extending substantially the full length thereof and opening outwardly through one end to provide a pointer and to form a window through which said spiral row of openings may be exposed one at a time during relative rotation of the sleeves, and a core of cylindrical shape tted in the inner sleeve and displaying calculating characters exposed through said openings.

ELI SANDERS. 

